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We want fossils of plants and animals that lived for a relatively short amount of time, like a few hundred thousand years or so.I know that doesn't seem like a very short time span, but it is when we're talking about geologic time.One outcrop shows layers from one geologic time period, while the other outcrop represents a different time. Can he put the pieces together to make the story more complete? Let's find out how scientists deal with this common problem by using the fossils inside the rocks.
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Watch this video to find out how we use index fossils to establish the relative ages of rocks.
In previous lessons, we talked about the Geologic Time Scale and how scientists use it to piece together the history of the earth.
He worked in Southern England, and he got to see all kinds of different rock strata that were exposed in outcrops and canals.
William Smith collected fossils from his work sites and, over time, he learned to recognize which fossils tended to show up in which rock strata.
Index fossils help us to distinguish between rock strata from different time periods, so it's important that they don't cover too much historical ground.
We wouldn't want to use a horseshoe crab fossil, because horseshoe crabs have existed for over 400 million years and are still alive today!
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An index fossil is a fossil representing a plant or animal that existed for a relatively short duration of time.
These are the fossils that we want to use for relative dating.
They follow an ordered progression that is very clear and predictable.Tags: Adult Dating, affair dating, sex dating